Burglar alarm



J. J. POPE BURGLAR ALARM Oct 13, 1925- Filed June i?, 1922 V /v//// MFN?! uw Q N MWI Patented Oct. 13, 1925.

UNITED STATES JOHN J. POPE, BROOKLYN, NEW YORK.I l

BURGILAR ALARM.

Application filed June 7,

To all whom may conce/wn.' j

Be it known that I, JOHN J. Porn, a citi zen of the United States,`resi'ding in Brooklyn, in the county of Kings and State of. New York, have invented certain new and useful lmprovementsin- Burglar' Alarms, of which the followingis ,a specilication.

This invention relates to improvements in electric alarms for doors, windows and other like openings in homes, stores or garages.

An important object is to provide means whereby when a door is forced against its jamb by the use of a jimmy or any other instrument an alarm is operated. o

Another object is to cause an alarm or a bell to ring if an attempt is made to force the door from its hinges.

Another object is to cause an alarm when a jimmy or any other metallic instrument is inserted between the door and its jamb or casing thereby closing an electric circuit.

Another object is to .arrange forthe concealment of the actuating mechanism at or near the lock.

In the accompanying drawing, Figure 1 is a. front elevation. of a door and its casing, showing, in dotted lines, the concealed contact plates, the wiring, battery and alarm Fig. 2 is a sectional view of Fig. 1, showing contact plates and wiring embedded in the door and its casing.

Fig. 3 is a fragmentary section showing a contact being made by the use of aj immy.

Fig. 4 is another section, showing Contact plates forced together when a jimmy has been inserted in the hinge side of the door and its casing.

Fig. 5 is another fragmentary section, showing both contact platesin the door casing, and a short-circuiting co-ntact being made by a jimmy.

Figure 1 discloses a door 1, supported by hinges 2 in the usual manner to a casing 4, 5 and 6, and opposite the hinges, a knob and lock as 3. On the lock side of the door, contact plates 10 and 11 forming opposite legs of an electric current will be noted as in Figs. 1, 2, 3 and 4. The plate 10 is ra-bbeted into the edge of the door and is not visible from the outside. The other co-operating plate 11 is also sunk into the door casing, and extends, with plate 10, for a predetermined distance above and belo-w the lock 3.

Referring to Figure 1, a.- conductor wire 7 is securely fastened to and runs from con- 1922. serial- No. 566,613.

. tact plate 10 to the hinge 2,'anld may be electrically connected thereto (see Fig. 2), and j from thenceto the battery A. yAnother con ductor, 9, will be kseen leading Yfrom the contact pliate '11, through the casing and thence E to the alarm bell v3.

It will be seen from this description and the drawing that if the circuit is closed by bridging or contacting the two contact plates l0 and 11, the circuit 7 9 would be closed and cause the alarm bellto be rung.

'Figure 3 shows Contact being made between the plates 10-11 by means of a jimmy 12 or other similar tool, by being inserted in the space 17 between the door 1 and its casing 4.

1n Figure 4 there is shown a contact made between the plates 10 and 11, by inserting a burglars tool 12 in the space 18 between the door 1, and its casing 6 at the hinge side. The door 1 is forced over and the two plates 10 and 11 are brought together, as 13, Figure 4. l

By referring to Figure 5, it will be seen thlat two plates 14 and 15 can be placed alongside one another in the door casing 4 and insulated from each other, and a burglars tool 12 forced in between the door 1 and its casing 4, will make a contact between f the two plates and cause an alarm to be sounded.

Another plate` as 16, Figure 5, can be countersunk into the door 1 to act as contact maker and if a tool 12 is forced between the door 1 and its casing 6 atthe hinge side, a Contact will be made. I

It is obvious that Various changes and modifications may be made to the details of construction without departing from the spirit of the invention as set forth in the appended claims.

I claim: u

1. The combination of, a frame having an opening; a member adapted for closing said opening and movable from closing position to open position; an electric contact member on a face of said closing member; an electric contact` member on a face of the frame in opposed relation to the first contact member; source of supply of electricity; means for conducting an electric current from said source to the first Contact member; means forv conducting an electric current from said source to the second contact member, said members normally being out of contact and the circuit open; and an electrically operated alarm means in one of said conducting` means; said contact members being made active for closing the circuit and operating the alarm means by forcible insertion or' an implement of conducting material between opposed faces of said closing member and frame While the closing member is maintained in closingv position in said frame.

2. In an electrical signaling device, the combination Wit-l1 an open frame, of means pivotally movable Within said frame to close Jthe same, an electrical contact plate on one edge face of? said frame` an electrical contact member on said movable means in opposed relation to and adjacent. said edge frame of the door, a source of electricity, means for connecting` each of tlie respectivel contact plates with "said source, to form an open electric circuit, an electrically operable alarm in said circuit, said alarm being in the circuit between the contact plates, said contact plates being 'situated so as to be bridged to close the circuit and operate the alarm by tlie insertion of a. metallic implement between the opposed fac-es of the door and frame While the door is maitained in closed position Within the frame.

JOHN J. POPE. 

